<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>index10-3</title>
</head>
<body>
index10-3<br />
<input type="button" value="回退" onclick="backFun()"/>
<script type="text/javascript">

  function backFun(){
    // 回退
    window.history.back();
  }

</script>
</body>
</html>